Pump

ABSTRACT

THE INVENTION PROVIDES A PUMP HAVING A PUMPING ACTION SIMILAR TO THAT OF A A SLIDING VANE ROTARY PUMP, BUT WHICH HAS A NON-ROTARY PUMPING ELEMENT. THE PUMP COMPRISES A CYLINDRICAL PUMP CHAMBER HAVING AN INLET PORT AND AN OUTLET PORT, A CYLINDRICAL PUMPING ELEMENT DISPOSED WITHIN SAID PUMP CHAMBER SAID PUMPING ELEMENT BEING OF A DIAMETER LESS THAN THAT OF THE PUMP CHAMBER, A TONGUE ENGAGED WITHIN A RECESS FORMED IN THE PERIPHERY OF SAID PUMP CHAMBER BETWEEN SAID INLET AND OUTLET PORTS SAID TONGUE BEING IN OPERATIVE ASSOCIATION WITH SAID PUMPING OPERATION, A CAM OR ECCENTRIC ROTATABLY ENGAGED WITHIN A BORE OF SAID PUMP ELEMENT, AND A DRIVE SHAFT CARRYING SAID CAM OR ECCENTRIC JOURNALLED IN BEARINGS OF THE PUMP CHAMBER.

June 1972 CHAN YUEN'LIK 3,667,875

rum- Filed Jan. 6, 970

INVENTOR:

CHAN Y EN LIK 3,667,875 I PUMP Chan Yuen Lik, Lot 5030, Hong Kong Filed Jan. 6, 1970, Ser. No. 939 Claims priority, applicationGreat Britain, Jan. 7, 1969,

950/69 Int. c1. F04c 1/02 ii.s.'c1." 418-56 1 Claim SABSTRACT DISCLOSURE The invention provides a pump having a pumping action similar to that of a sliding vane rotary pump, but which has a non-rotary pumping element. The pump comprises a cylindrical pump chamber having an inlet port and an outlet port, acylindrical pumping element disposed within said pump chamber said pumping element being of a diameter less than that of the pump chamber, a tongue engaged within a recess formed in the periphery of said pump chamber between said inlet and outlet ports said tongue being in operative association with said pumping operation, a cam or eccentric rotatably engaged within a bore of said pumping element, and a drive shaft carrying said cam or eccentric journalled in bearings of the pump chamber.

This invention relates to pumps for handling fluids generally, and more particularly, although not exclusively, water, and has for its object to provide an improved pump construction which, whilst having a pumping action similar to that of a sliding vane rotary pump, has a non-rotary pumping element whereby friction and wear is reduced and the overall efiiciency enhanced.

Broadly, according to the invention, and in one mode of embodiment, a pump comprises a cylindrical pump chamber having an inlet port and an outlet port, a cylindrical pumping element disposed within said chamber said pumping element being of a diameter less than that of the pump chamber, a tongue or blade engaged within a slot or recess formed within the periphery of said pump chamber between said inlet and outlet ports, said tongue or blade being in operative association with said pumping element, a cam or eccentric rotatably engaged within a bore of said pumping element, and a drive shaft carrying said cam or eccentric journalled in suitable bearings of said pump chamber. Said tongue or blade may be formed integrally with, or separately from, said pumping element.

In operation, said cam or eccentric rotates within the pumping element and imparts to same a pumping action similar to that of a sliding vane rotary pumping element, but without rotation of said pumping element itself. Axial grooves or channels may be provided in the bore of the pumping element thereby to provide a lubricating circulation of water or other fluid therehetween. Further. axial fins may be formed on the outer periphery of said pumping element to enhance operative engagement of said pumping element with the pump chamber and also to provide improved dimensional tolerance.

The invention is further described with the aid of the accompanying explanatory drawings which illustrate, more or less schematically, two modes of embodiment.

In said drawings: a

FIG. 1 is a longtiudinal section of a pump according to the invention taken as on line AA of FIG. 2; and

'FIG. 2 is a section taken as on line BB of FIG. 1.

FIG. 3 is a fragmentary sectional view illustrating an alternative embodiment of the invention.

FIG. 4 is a view similar to that of FIG. 3 but of yet a further embodiment.

Patented June 6, 1972 Referring to said drawings, the numeral 10 generally denotes a cylindrical pump chamber provided with end plates 11, 12 formed with bearing bosses 13, 14 for a drive shaft 15. If desired, the bearing boss 14 may be extended, as shown in broken lines in FIG. 1, and be formed with an additional bearing 13a for the shaft spaced from the bearing 14 thus obviating the need for the bearing 13 and enabling end plate 11 to function simply as a cover plate.

Said pump chamber 10' is formed in its periphery with inlet and outlet ports 16, 17, and between said ports 16,

17 there is formed a recess 18 having a restricted mouth as shown. Disposed within the pump chamber 10 is a cylindrical pumping element 19 composed of a suitable resilient material, eg a natural or synthetic rubber composition or a resilient plastics material. Engaged within the recess 18 is the head 21 of a resilient blade or tongue component 20, said blade or tongue components 20 being in operative engagement with the periphery of the pumping element 19. Said blade or tongue 20 extends for the full width of the pump chamber 10 as shown most clearly in FIG. 1.

A drive shaft 15 is journalled in the bearing 13, 14 of the end plates 11, 12 and keyed to said shaft 15 within the bore of the pumping element 19 is an eccentric or cam 22 which is a rotary fit within said bore. To provide for a circulation of water (or other fluid which is being handled) as a lubricant between the pumping element 19 and the periphery of said eccentric or cam 22, said bore is formed with a series of axially extending grooves 23. Further, grooves 25, 26 are formed respectively in the end plates 11, 12, said grooves 25, 26 leading from the ports 16 and 17 radially inwards thereby to provide for the circulation of Water through said axial grooves 23 from the outlet port to the inlet port. Pins 27 also are formed on the periphery of the pumping element 19.

If desired said tongue or blade component 20 may have a reinforcement 24 embedded therein.

In use, when power from any convenient source is applied to the shaft 15, the eccentric or cam 19 is rotated Within the bore of the pumping element 19 to impart to the latter a pumping action whereby fluid (e.g. water) may be drawn into the port 16 and expelled from the port 17, or vice versa, according to the direction of rotation of the shaft 15.

Referring now to FIG. 3, this illustrated an alternative embodiment of the invention which operates in substantially the same manner as the embodiment of FIGS. 1 and 2, but wherein the tongue or blade 20a of the pump is of unifoil character and is formed integrally with the pumping element 19. Said tongue or blade has an enlargement or head 21a which is engaged within the recess 18a of the pump chamber 10. As before, said tongue or blade 2021 may be provided with a reinforcement 24a.

Referring to FIG. 4, the pumping element 191) of this embodiment also is formed integrally with a tongue or blade 20b, but in this instance said tongue extends substantially radially from the periphery of the pumping element 19b. Said tongue is engaged within a recess 18b of the pump chamber being prevented from complete withdrawal therefrom by an enlargement or head 21b, and the recess 18b is of a radially elongated nature to provide for the displacement therein of the head 21b of said tongue or blade 20b during the pumping action of the pumping element 19b.

It will be seen that a pump according to the invention will be simple to construct, will have a high overall efliciency, and be less liable to wear and derangement in use, than a conventional sliding vane type rotary pump.

I claimr" -1."Apumpcomprising a housing having a closed end cylindrical pump chamber therein, an inlet port leading to a side of said chamber and an outlet port leading to said chamber side, a resilient cylindrical pumping element coaxially positioned within said chamber and said pumping element being of a diameter lessthan that of saidchamber, said housing having a recess extending longitudinally of said chamber side, between said ports and having a restricted mouth opening in said chamber, a resilient tongue having a head in said recess and with a pair of diverging blades extending into said chamber to the periphery of said pumping e1ement,-With each one ofsaid blades extending between one of said ports and said pumping element and having an end slideably con- 15 tacting said pumping element periphery, said pumping element having a bore, an eccentric coaxially and rotatably mounted in said pumping element bore and a drive 7 H R ef erehces cited "UNITED STATES 'FKTEfiTE 51.1935 Great Britain ,-*"--'4 WILLIAM L. FREEH 1iry, -x5n in 5 it, .3. cigar-1 

